error ID: 210018 - failed to check out license feature ProfessionalEdition

I recently borrowed a Professional license from my Activation server. I didn't know about that option, but I tried it since I needed it to access a functionality. Today, I get a message saying I need to return it. I tried to, and it booted me out with this error message: error ID: 210018 failed to check out license feature ProfessionalEdition.

Nothing works, I just can't change the license. How can I fix this? Thanks.

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